CLAEIAS. 



243 



which equals width of mouth and \ length of head ; band of prse- 

 maxillary teeth 6 times as long as broad ; vomerine teeth granular, 

 forming a crescentic band which is as broad as the praemaxiilary 

 band ; nasal barbel \ to f length of head ; maxillary barbel nearly as 

 long as or a little longer than head, reaching middle or end of pectoral 

 tin ; outer mandibular barbel § to 1 length of head, inner { to |. 

 20 to 23 gill-rakers on anterior arch. Clavicles hidden under the skin. 

 Dorsal 85-95, its distance from occipital process ^ length of head, its 

 distance from caudal 2 diameters of eye. Anal 65-75, its distance from 

 caudal 1^ to 2 diameters of eye. Pectoral not quite \ length of head, 

 the spine smooth or slightly serrated and § the length of the fin. 

 Ventral 1^ times as distant from caudal as from end of snout. Caudal 

 a little less than \ length of head. Dark brown above, white beneath. 



Total length 450 millim. 



Ja River (Congo System), South Cameroon. 



1-2, 3. Types. Ja R. at Bitye. G. L. Bates, Esq. (C). 



4-5. Tpyes. „ at Esamesa. ,, 



13. CLAEIAS CARSONII. 

 Bouleng. Ann. & Mag. N. H. (7) xii. 1903, p. 362, Fish. Nile, p. 294, pi. liii. 

 fig. 1 (1907), and Proc. Zool. Soc. 1907, p. 1077. 



Depth of body 6i to 9^ times in total length, length of head 4^ to 5 

 times. Head \\ to 1^ times as long as broad, smooth ; occipital 

 process angular, not longer than broad ; frontal fontanelle sole-shaped 

 or knife-shaped, 2\ to 3 times as long as broad, 4 or 5 times in length 



Fi<r. 202. 



,. 



^^^^^^^w 



^p^ 



Clarias carsonii. 

 L. Victoria (F. N.). f. 



of head ; occipital fontanelle small, in advance of or encroaching a little 

 on occipital process ; eye 3 to 5 times in length of snout, 6 to 8f times 

 in interorbital width ; width of mouth a little less than interorbital 

 width; band of prsemaxillary teeth 3^ to 5 times as long as broad ; 



E2 



